How Can I Retrieve the Final SQL Query from a PreparedStatement in Java for Debugging?

Retrieving Query from PreparedStatement for Debugging

In Java database programming, the java.sql.PreparedStatement class is commonly used to execute SQL queries with parameterized inputs. When debugging SQL issues, it can be helpful to retrieve the final query string before executing it.

To determine if your JDBC driver supports retrieving the query string, you can call PreparedStatement#toString(). Some drivers, such as PostgreSQL and MySQL, may return the complete SQL statement through this method.

For example:

<code class="java">System.out.println(preparedStatement);</code>

If your driver does not support this behavior, an alternative approach involves using a statement wrapper library, such as P6Spy. These libraries intercept and record the calls to the setXxx() methods, and they can generate the SQL query string based on this information.

If neither of these options is available, consider submitting an enhancement request to the JDBC driver development team to implement the desired toString() behavior. This will allow for easier debugging by enabling you to retrieve the actual query that will be executed.

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